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There isn't a firmware.bin file anywhere in the GitHub repo because it contains uncompiled source code. The instructions in the first part of the guide (before the bit where I say to upload the file) are how to actually make the file by compiling the code.There was another disgruntled redditor a few months back who didn't want to do that, so I compiled the source code for them and put it on a releases page. To their credit, they later came back, gave the post a thorough read and found the information useful, which is what I'd hoped for in making it.On the second point, they use GitHub because, like many other professional companies, they rely on open source projects, whose licenses require them to publish and attribute the code. The firmware is from a project called Marlin. One great thing about this is that people who don't work for the company can come along and make changes and fixes to the code, as I did. In fact, the BIQU-B1 wouldn't exist if the Ender 3 design it's derived from weren't also open source and on GitHub.Finally, I don't know if you used the correct firmware.bin file, but "nothing" will appear to happen when you upload the firmware. I described how to tell if it's uploaded in the post. You'll probably find that the printer/BLTouch doesn't work properly immediately after you've updated the firmware. The steps after "Uploading the firmware" are needed to get it working.